検索結果 1329件中 1-20 を表示

  • 回転曲げ疲労試験における繰返し速度の拡張について

    山本 泰三 , 廉 本寧 , 後藤 浩二

    … <p>Fatigue property in gigacycle regime is focused as an important subject in recent years. … In such a long-life region, a tremendous long period is required to perform the fatigue tests. … In order to overcome this difficulty, special types of fatigue testing machines in rotating bending whose loading type is cantilever bending has been developed. …

    日本機械学会論文集, 2017

    DOI

  • ガス窒化処理したSCM435鋼の回転曲げ疲労強度に及ぼす表面化合物相の影響

    平岡 泰 , 石田 暁丈 , 梅澤 修

    <p>ガス窒化・軟窒化したSCM435鋼の回転曲げ疲労強度を評価した。化合物層形成材は化合物層無し材よりも高い疲労強度を示し,γ′相の場合において顕著であった。化合物層は,拡散層より高い降伏強さと大きな圧縮残留応力を示すことから,初期き裂抑制効果がある。ε相,γ′相いずれにおいても複数の微小き裂形成により,主き裂先端の応力集中を緩和し,疲労強度を高める。さらに,γ′化合物は,ε化合物よ …

    熱処理 57(2), 64-72, 2017

    DOI

  • スーパー二相ステンレス鋼の疲労強度に及ぼす荷重様式と平均応力の影響

    有働 竜二郎 , 西川 嗣彬 , 波東 久光 , 宮崎 克雅 , 政木 清孝 , 沼倉 宏

    … <p>As a first step toward building a database of fatigue strength of super duplex stainless steel S32750, fatigue tests have been conducted by three methods, axial loading, plane bending and rotating bending, and with some different values of stress ratio <i>R</i> …

    鉄と鋼 103(4), 201-207, 2017

    DOI

  • Intrinsic Factors that Trigger the Coaxing Effect in Binary Fe–C Ferritic Alloys with a Focus on Strain Aging

    Koyama Motomichi , Ren Bohong , Yoshimura Nobuyuki , Sakurada Eisaku , Ushioda Kohsaku , Noguchi Hiroshi

    … <p>The coaxing effect has been recognized as a phenomenon that enhances the fatigue resistance associated with work hardening and strain-age hardening. … To uncover the intrinsic factors that affect the degree of coaxing effect, rotating bending fatigue tests including a process of stepwise stress increases every 10<sup>7</sup> …

    ISIJ International 57(2), 358-364, 2017

    DOI

  • スーパー二相ステンレス鋼の疲労強度に及ぼす荷重様式と平均応力の影響

    有働 竜二郎 , 西川 嗣彬 , 波東 久光 , 宮崎 克雅 , 政木 清孝 , 沼倉 宏

    … <p>As a first step toward building a database of fatigue strength of super duplex stainless steel S32750, fatigue tests have been conducted by three methods, axial loading, plane bending and rotating bending, and with some different values of stress ratio <i>R</i> … The fatigue limits from the bending tests turned out appreciably higher than those from the axial loading. …

    鉄と鋼, 2017

    DOI

  • C-22 GFRPの疲労強度特性に及ぼす切欠きの影響

    瀬戸口 進太 , 小田原 悟

    … It was clarified that the notch effect on the fatigue strength characteristics of the GFRP used for blade material of a small wind turbine. … To elucidate the fatigue strength characteristics at rotating bending fatigue test, observation of the fracture surface of the test piece was conducted. … Furthermore it can track the behavior of crack growth, and the mechanism of fatigue properties of GFRP was considered. …

    日本機械学会九州支部講演論文集 2016(69), 121-122, 2016-03-15

  • Ti-6Al-4V合金の高サイクル疲労特性に及ぼすジルコニアショットピーニングの影響

    政木 清孝 , 與那國 優希 , 久森 紀之 , 須賀 祐一郎 , 小林 祐次 , 後和 大輔

    … <p>Rotating bending loading and axial loading fatigue tests were conducted to investigate the effect of zirconia shot peening on fatigue properties of Ti-6Al-4V ELI alloy. … As a result of the rotating bending fatigue tests, the fatigue lives of shot peened specimen were longer life than non-peened specimen. …

    材料 65(9), 679-686, 2016

    DOI

  • アルミニウム合金A5083P-Oのギガサイクル疲労特性と停留き裂に関する検討

    西川 嗣彬 , 竹内 悦男 , 古谷 佳之

    … <p>In this study, Giga-cycle fatigue properties for A5083P-O aluminum alloy were investigated by ultrasonic fatigue testing at 20 kHz, rotating bending fatigue testing at 100 Hz and electromagnetic resonance type fatigue testing at 100 Hz. …

    材料 65(9), 672-678, 2016

    DOI

  • 陽電子消滅法によるステンレス鋼 SUS316 の微小疲労き裂発生挙動評価

    植松 美彦 , 服部 兼久 , 柿内 利文 , 上杉 直也 , 仲尾 文哉

    … <p>Fatigue cracks, leading to catastrophic fracture of metal structure, generally initiate by the cyclic stress even under yield stress. … At the first stage of fatigue process, movement and increase of lattice defects (dislocations), namely microscopic sliding takes place, and crack initiation follows thereafter. …

    ばね論文集 2016(61), 7-12, 2016

    DOI

  • Mechanical Properties of Case-Hardened Low Cr Sintered Steel

    KOBAYASHI Akio , MAETANI Toshio , OGURA Kuniaki , NAKAMURA Naomichi , UNAMI Shigeru , OZAKI Yukiko

    … 5CRA) shows a rotating bending fatigue limit of 510 MPa after compacting, sintering and case-hardening process. … In spite of the higher fatigue limit, its tensile strength is lower than that of the 4Ni based material. …

    粉体および粉末冶金 63(7), 573-578, 2016

    DOI

  • 水焼入れFe-Cフェライト鋼における粒界き裂発生および微小き裂進展挙動

    小山 元道 , 周佳 羲 , 吉田 裕一 , 吉村 信幸 , 潮田 浩作 , 野口 博司

    … The fatigue crack initiation and propagation behavior of a water-quenched binary Fe-C fully ferritic steel was investigated though rotating-bending fatigue testing. … As a result, intergranular cracking was the dominant cause of fatigue damage in the steel. … Dominancy of the intergranular fatigue crack propagation increased with increasing stress amplitude. …

    鉄と鋼 102(5), 268-273, 2016

    J-STAGE DOI

  • Effect of Ultrasonic Shot Peening on High Cycle Fatigue Behavior in Type 304 Stainless Steel at Elevated Temperature

    KAKIUCHI Toshifumi , UEMATSU Yoshihiko , HASEGAWA Norihiko , KONDOH Eisuke

    … Ultrasonic shot peening was applied to type 304 austenitic stainless steel and four-point rotating bending fatigue tests were performed at room temperature (R.T.) and 573K up to 108 cycles. … The fatigue strengths at 573K were much lower than those at R.T. … The shot-peened specimens exhibited higher fatigue strengths than untreated ones at both R.T. …

    材料 65(4), 325-330, 2016

    J-STAGE DOI

  • Effects of Number of Graphite Nodules on Fatigue Limit and Fracture Origins in Heavy Section Spheroidal Graphite Cast Iron

    Shiraki Naoto , Usui Yuki , Kanno Toshitake

    … The purpose of this study is to investigate the effects of number of graphite nodules on fatigue limit and fracture origins in spheroidal graphite cast iron where carbon content and the number of graphite nodules are changed. … The rotating bending fatigue test was conformed to JIS (Japanese Industrial Standards). …

    MATERIALS TRANSACTIONS 57(3), 379-384, 2016

    DOI

  • GS0204-256 アルミニウム合金A5083P-Oのギガサイクル疲労特性

    西川 嗣彬 , 竹内 悦男 , 古谷 佳之

    … In this study, Giga-cycle fatigue properties for A5083P-O aluminum alloy were investigated by ultrasonic fatigue testing at 20 kHz, rotating bending fatigue testing at 100Hz and electromagnetic resonance type fatigue testing at 100 Hz. …

    M&M材料力学カンファレンス 2015, "GS0204-256-1"-"GS0204-256-2", 2015-11-21

  • GS0201-411 リアルタイム疲労き裂観察によるSCM435の疲労き裂進展特性評価

    岩下 達博 , 三浦 拓 , 上野 明

    … In order to evaluate the fatigue strength of the machine structures, it is necessary to know the fatigue crack propagation properties. … Conventionally, a replica method has been used to observe the fatigue crack propagation properties. … However, a lot of time and trouble are taken with copying the fatigue crack shape down from the specimen surface. …

    M&M材料力学カンファレンス 2015, "GS0201-411-1"-"GS0201-411-3", 2015-11-21

  • OS8-6 Influence of Fine Particle Peening on Rotating Bending Fatigue Strength of the Aluminum Alloy 5052(Shot peening,OS8 Fatigue and fracture mechanics,STRENGTH OF MATERIALS)

    Nambu Koichiro , Inagaki Kazutoshi , Maeyama Yuto , Egami Noboru

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2015(14), 116, 2015-10-04

  • J0420105 非接触AE三計測システムを用いた回転体の疲労損傷モニタリング

    畠中 大祐 , 松尾 卓摩

    … The rotating components has used commonly for mechanical components. … However, fatigue monitoring of rotating components is difficult during the operation because surface of rotating component can not contact the sensor. … In this study, fatigue monitoring of rotating components using non-contact AE (Acoustic Emission) monitoring system was developed. …

    年次大会 : Mechanical Engineering Congress, Japan 2015, "J0420105-1"-"J0420105-4", 2015-09-13

  • G0301505 冷間工具鋼の回転曲げ疲労強度に及ぼす一次炭化物の影響

    田中 涼 , 堀川 教世 , 宮島 敏郎 , 菓子 貴晴 , 上野 明 , 境田 彰芳

    … However fatigue strength of SKD11 decreased due to coarse carbides. … Rotary bending fatigue test in air at room temperature using hourglass shaped specimen is conducted to clarify S-N property and effect of the carbide on fatigue strength of cold work tool steels. …

    年次大会 : Mechanical Engineering Congress, Japan 2015, "G0301505-1"-"G0301505-4", 2015-09-13

  • G0300102 変位制御ねじり疲労試験のための試験片形状設計

    竹澤 克紀 , 小熊 規泰 , 筑田 豪

    … Most of tests to grasp fatigue characteristics have been performed under normal stress in rotating bending tests or axial loading fatigue tests. … It is also important to clarify fatigue strength characteristics under shear stress from design aspect. … So, we have developed a multiple-high-speed torsion fatigue testing machine which has a rotating-reciprocating-swinging conversion mechanism. …

    年次大会 : Mechanical Engineering Congress, Japan 2015, "G0300102-1"-"G0300102-4", 2015-09-13

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